Soybean Aphid
Also look for ants and ladybird beetles. |
V1-2 . Scout two times per week during this time period. Continue scouting through pod set. |
In early July, start scouting to become familiar with the aphid pressure in your fields. Use a hand lens or other magnifier. |
V1-2: Under young upper leaves, petioles, and stem.
Vn: new branches in the lower canopy.
R1-R4: undersides of mid-canopy leaves and stems. |
Bean leaf beetle |
First-generation peak in late V or early R stage.
Second-generation peak during pod-fill stage. |
Early July (first generation)
August (second generation). |
|
Phytophthora root or stem rot |
vegetative stages |
July and August |
Wet and waterlogged soils. Compacted soil. |
Seedling blight Pythium or Fusarium |
before V2 |
late May or when soil temperatures are cold (<60°F) |
low and wet spots |
Seedling blight Phytophthora or Rhizoctonia |
before V2
(late planted) |
mid-June or when soil temperatures warm to 70-80°F. |
low and wet spots |
Soybean Cyst Nematode |
6 weeks after planting up until 3 to 4 weeks before harvest. |
Easier to observe on soybean roots early in the season. |
A suspect area:
a field entrance, areas that had flooded, weedy areas, lower yielding areas. |
Spider Mites |
any stage |
July and August, especially during periods of drought |
plants near the edges of the fields or where soybeans are stressed |
Stem borer |
late V, early R |
mid-summer |
Individual wilted or dying leaves in the middle of the canopy.
Later in the season, look for lodged plants. |
Sudden death syndrome |
pod setting |
after mid-August |
high-moisture areas in fertile fields |
White mold mushroom (apothecia) |
at canopy closure |
last week of June,
1st week of July,
varies with row spacing |
high soil moisture areas, especially during flowering.
Areas where moisture collects due to fogs, extended dew periods and pockets of poor air drainage. |
White-mold- infested plants |
pod setting |
August-September |
visibly dead plants |